Wolfenstein 3D, the hit classic first-person shooter, is celebrating its 20th anniversary. In celebration of the 20th anniversary, there are all kinds of perks and free stuff for fans.

Most important of the awesome offers for the anniversary is a price drop for the iOS version of the game, Wolfenstein 3D Classic Platinum. As of May 9th, the game dropped from $1.99 to free. The game won't be free permanently. It's only on sale for a limited time.

An addition, there's now a browser version of the game launched at Bethesda's website and on the Wolfenstein Facebook page. Upon writing that last sentence, I was immediately distracted by about a half hour of playing Wolfenstein in my browser.

I immediately downloaded the iOS version of Wolfenstein when I heard it was free. I grew up with the game. It was the first first-person shooter I ever played. It may have been the first computer game I ever played. Those looking for some nolstagia over the weekend are in for a treat.

We’re always interested in looking at new spins of classic games. Just last week we took a look at Roc-a-Tac, a mashup between popular classics tic-tac-toe and rock-paper-scissors. Sticking with the tic-tac-toe theme, Kenneth Boreham’s Grid of War is tic-tac-toe with some new twists.

The game starts with the classic tic-tac-toe board but expands to a 5x5 board once one of the players makes three in a row. The goal is to get five in a row. Users can use two different special abilities that make the gameplay even more action-packed. Bombs are used to blow up both an ‘X’ or ‘O’ and the tile itself. No Xs or Os can be placed on a tile that’s been bombed for one turn. The other special ability is the Switch, which can be used to change an X to an O or vice versa. Additionally, switched pieces become indestructible for a turn.

This new twist on classic tic-tac-toe is available for only $0.99 and is a universal app.

Mash-ups seem to be a good way to make a creative and potentially enjoyable iOS game. This mash-up, Rock-a-Tac, is a mix between simple classics tic-tac-toe and rock-paper-scissors. This confrontation of double hyphenated games includes a tic-tac-toe board being filled up by either rocks, paper, or scissors.

The win a game of Rock-a-Tac, users must fill a row with either rock, paper, or scissors. But, unlike tic-tac-toe, there are no ties in Rock-a-Tac. When a board is filled with no winner, rows are won by rock-paper-scissor elements.

There are both single and multiplayer modes in Rock-a-Tac. The single player mode pits players against an AI opponent while multiplayer can be against friends or random opponents via Game Center.

For mixup of two very simple games, the graphics look quite interesting. There are various arenas to do battle on and different looking teams to compete with (including heroes and villains). There are both free and paid versions. The paid version is $0.99 and includes no ads.

This week at 148Apps.com, we checked out the long-awaited release of Readability, via a quick overview and full review from Lisa Caplan. Caplan writes, "The app provides the same service and merges seamlessly with the web versions. Users open to a blank page with just a menu. Filling the app is the the reader’s job. Users can search the web or enter an URL manually. The app pulls the article, pretties it up, and places a lead-in on the home screen.

I found it faster to just surf on my Mac adding articles that appealed as I found them, but how one fills the app is a small matter. What Readability does with the content is the cool bit. I tested the universal build on an iPad and it works wonderfully in both orientations. In landscape the articles fill the main pane and a well-designed and unobtrusive sidebar has the menu. In portrait the sidebar is a tiny top bar."

Meanwhile, our sister site Giggleapps.com dug deep into the garden of apps and came up with a review of The Giant Turnip: A Kidztory Classic Animated Interactive Storybook. Reviewer Amy Solomon says, "As always, the look of this app is delightful, with wonderful colors and textures and fun use of music incorporated into a style utterly recognizable as a Kidztory storybook. I appreciate the warm browns and green shades seen in the land where the turnip is planted, along with the noticeable brush strokes for a lovely effect. Possibly more so than other apps from this series, nothing is flat-looking within this app as every animal or other detail has its own imperfect texture that layered together on the page really brings a richness to this story that adults may enjoy even more than their children."

Finally, 148Apps.biz updated GameSpy's progress on its GameSpy Open platform. Brad Hilderbrand writes, "Today GameSpy announced that there are over 600 titles in development for its year-old GameSpy Open platform. The stable of upcoming titles includes games like Warm Gun, Skullgirls and more, with a total of 1200 developers hard at work on new projects."

The old week is done. Bring on the new week, with the promise of the iPad 3 just around the corner. In the meantime, follow us on Twitter or Like us on Facebook to keep abreast of the latest reviews, news items and contests right when they happen. See you next week!

And here it is, the more contemporary Prince of Persia scaled back to the original Prince of Persia. Confused? Don't be. It's the same classic that we all know and love, just with a bit of a face-lift.